JPH0415808Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an operating device for a front loader mounted on an agricultural tractor or the like.

(Prior art) In a front loader, the boom and bucket are rotated by the telescoping action of a hydraulic cylinder, and the hydraulic cylinder is controlled by sliding a control lever provided on the control section of the tractor. It will be done. As this type of operating lever device, for example, Japanese Utility Model Application Publication No. 193432/1983
89852) is publicly known.

In the above-mentioned conventional operating lever device, by sliding the operating lever back and forth, left and right, the operating switch provided in the box is turned on and off, which turns on and off the solenoid valve of the hydraulic cylinder. The cylinder was designed to expand and contract.

The above conventional ones control the operation of the operating lever by converting it into an electric signal, but there are also those that control the spool of the hydraulic control valve by sliding the operating lever.
The one described in the above publication is publicly known.

The electric or hydraulic operating device described in the above publication selectively operates either the boom cylinder or the bucket cylinder, but it is also possible to operate both cylinders simultaneously.

(Problem to be solved by the invention) In the case where the bucket cylinder and boom cylinder are operated simultaneously with a single operating lever, the operator must operate the bucket's horizontal grounding, horizontal raising and lowering by feeling. , and its operation required skill. In other words, simultaneous operations are extremely dangerous for beginners.

SUMMARY OF THE INVENTION An object of the present invention is to provide an operating device for a front loader that allows even a beginner to easily raise and lower a bucket horizontally.

(Means for Solving the Problems) A feature of the present invention to achieve the above object is a front loader operating device that allows the bucket cylinder and boom cylinder to be operated simultaneously with one operating lever. wherein a guide plate for regulating the positioning of the simultaneous operating lever is detachably attached to at least one of the bucket scoop and boom lowering position or the bucket dumping and boom raising position of the operating lever, and the mounting position can be changed freely. It is in.

(Function) According to the present invention, for example, if X and Y coordinates that are orthogonal to each other are imaginary on the control panel of the control lever, only the boom cylinder will expand or contract when the control lever is operated on the X axis, and when the control lever is operated on the Y axis, only the boom cylinder will expand or contract. Only the bucket cylinder expands and contracts. Then, the boom cylinder and bucket cylinder are simultaneously operated by operations in the first, second, third, and fourth quadrants of the X and Y coordinates.

For example, in order to keep the bucket in a horizontal position while raising the boom, it is necessary to rotate the bucket as the boom rises. That is, the boom cylinder and bucket cylinder must be operated simultaneously. When performing this simultaneous operation using a single operating lever, the operating lever is operated along the guide plate. That is, the shape of this guide plate is specified so that when the operating lever is moved along the guide surface, the bucket can be raised while maintaining a horizontal attitude. By adjusting the position of this guide plate, various desired simultaneous operations can be achieved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIG. 2, 1 is a tractor body, 2 is a front wheel, 3 is a rear wheel, 4 is a bonnet, 5 is an instrument panel, 6 is a steering wheel, and 7 is a driver's seat. A cabin 8 is mounted on the tractor body 1 so as to cover the instrument panel 5, the steering wheel 6, and the driver's seat 7. The inside of this cabin 8 is used as the control section of the tractor. 9 is a front loader, mounting frame 1
The front loader 9 is attached to the front part of the tractor body 1 via the front loader 9, and the front loader 9 has a pair of left and right booms 11 pivotably attached to a mounting frame 10 so as to be able to rise and fall freely, and a bucket truck pivotably attached to the tip of the booms 11. 12
It also includes a boom cylinder 13 and a bucket cylinder 14. Reference numeral 15 denotes a control valve unit mounted on the mounting frame 10, and the control valve unit 15 includes a solenoid valve 16 for controlling the boom cylinder 13 and an electromagnetic valve for controlling the bucket cylinder 14, as shown in FIG. A valve 17 is incorporated. The solenoid valves 16 and 17 are of a three-position switching type and have ascending solenoids 18 and 21 and descending solenoids 19 and 20. In Fig. 3, 22 is an engine, 23 is a hydraulic pump, 24,
25 is a check valve, and 26 is a relief valve.

Reference numeral 27 denotes a control lever device for operating the solenoid valves 16 and 17, which is mounted on the side or top surface of the fender 28 in the cabin 8. An operating lever 30 is pivotally supported on this box 29 so as to be slidable back and forth and left and right. This control box 2
An operation switch (not shown) is built into the unit 9. This operation switch is, for example, an operation lever 3.
0 back and forth to control the solenoid valve 16 for controlling the boom cylinder 13;
A solenoid valve 17 for controlling the bucket cylinder 14 by sliding the operating lever 30 left and right.
control. Then, both cylinders 13 and 14 are simultaneously operated at any arbitrary position.

As shown in FIG. 1, the boom 11 is lowered by moving the operating lever 30 upward in the figure.
By moving the boom 11 downward, the boom 11 rises, and its center position is the neutral position. Furthermore, by moving the operating lever 30 to the right in the figure, the bucket 12 performs a dumping operation, and by moving it to the left, it performs a "scooping" operation. The left shoulder in Figure 1 is the position where "scooping" and "lowering" are performed at the same time, and a guide plate 31 is used to determine this position.
is detachably attached to the control box 29 and its attachment position can be changed.

That is, the guide plate 31 has a set position 3 of the operating lever 30 for "scooping" and "lowering".
2 has been determined. Further, the guide plate 31 is provided with a long hole 33, and the guide plate 31 is attached to the long hole 33 so as to be detachable and repositionable.

The guide plate 31 can be installed in the "dump" and "raise" positions on the lower right side of FIG.

In addition, as shown in FIG. 4, two guide plates 31,
31, it is also possible to determine the simultaneous operating positions of the operating levers 30.

Note that the present invention is not limited to the above embodiments. For example, although the above embodiment is an electric type, a spool type can also be adopted.

(Effects of the invention) According to the invention, even beginners can use the loader efficiently because the optimum position for simultaneous operation can be freely selected depending on the work.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the invention, Fig. 2 is a side view of a tractor employing the invention, Fig. 3 is a hydraulic circuit diagram, and Fig. 4 is a plan view showing another embodiment of the invention. It is a diagram. 13...Boom cylinder, 14...Bucket cylinder, 30...Operation lever, 31...Guide plate.

Claims (1)

[Scope of Claim for Utility Model Registration] In a front loader operating device in which a bucket cylinder and a boom cylinder can be operated simultaneously with a single operating lever, the operating lever is located in a bucket scooping and boom lowering position or in a bucket dumping and boom raising position. An operating device for a front loader, characterized in that a guide plate for regulating the positioning of the simultaneous operation lever is detachably attached to at least one of the levers, and the mounting position thereof can be changed.